"pigeon clock" meaning in English

{
  "forms": [
    {
      "form": "pigeon clocks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "pigeon clock (plural pigeon clocks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              62,
              74
            ]
          ],
          "ref": "1982, Paul Radley, My Blue-Checker Corker and Me, Sydney: Fontana/Collins, page 120:",
          "text": "When Corker trapped in Monte put her ring in the hatch of the pigeon clock[.]",
          "type": "quote"
        }
      ],
      "glosses": [
        "A timing device used to officially record the exact time a pigeon returns to its loft in a race."
      ],
      "id": "en-pigeon_clock-en-noun-dawnBZz0",
      "links": [
        [
          "timing",
          "timing"
        ],
        [
          "device",
          "device"
        ],
        [
          "loft",
          "loft"
        ],
        [
          "race",
          "race"
        ]
      ]
    }
  ],
  "word": "pigeon clock"
}

{
  "forms": [
    {
      "form": "pigeon clocks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "pigeon clock (plural pigeon clocks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "bold_text_offsets": [
            [
              62,
              74
            ]
          ],
          "ref": "1982, Paul Radley, My Blue-Checker Corker and Me, Sydney: Fontana/Collins, page 120:",
          "text": "When Corker trapped in Monte put her ring in the hatch of the pigeon clock[.]",
          "type": "quote"
        }
      ],
      "glosses": [
        "A timing device used to officially record the exact time a pigeon returns to its loft in a race."
      ],
      "links": [
        [
          "timing",
          "timing"
        ],
        [
          "device",
          "device"
        ],
        [
          "loft",
          "loft"
        ],
        [
          "race",
          "race"
        ]
      ]
    }
  ],
  "word": "pigeon clock"
}